\section{Introduction}\label{sec_introduction}
This report presents the details of a Level four Computer Science Honours project.  It entails the creation and evaluation of a new technique to provide CAPTCHA for blind people. CAPTCHAs provide the function of ensuring  that an entity using a website is human and not an automated process.  Automated processes known as ``bots" produce high amounts of spam, this reduces the overall effectiveness of the internet by reducing the quality of the findable information on the internet\cite{spamProblems}.  

Current techniques for providing CAPTCHA rely on vision, which provides a significant usability problem for blind users.  To provide a more accessible internet a new method of providing CAPTCHA which would also be accessible to the blind, must be created and become widely adopted on the internet. 

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The project entailed the development of an image-based CAPTCHA which would also be accessible to the blind.  The project had three phases: an automated image collector, 

The Evaluation of the project occurred in three phases.  The testing of the level fun experience by the users participating in the playing of the game .  




This report provides a detailed description of the following areas of the project:


\subsection{Breakdown of the Content of the report}

\paragraph{Chapter 2} - details an outline of the background surrounding the need for CAPTCHAs.  It also outlines the current techniques which are employed to determine if an entity accessing a webpage is human and example implementations of those techniques.  

\paragraph{Chapter 3} - gives detailed description of the three independent parts, which are required to generate the proposed CAPTCHA system.  

\paragraph{Chapter 4} - reports on the methodology used to determine the level of security and usability which the proposed solution provides.

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\paragraph{Chapter 5} - outlines results of experiments detailing what results were produced.


and determining an evaluation of the results produced through experiment and inferences on how successful, usable and secure the proposed CAPTCHA system is.

\paragraph{Chapter 6} - An outline of the implementation decisions as well as what tools were used in the creation of the system.  Finally the paper will state what further work be necessary to take the project forward.











